If even backpedaling legs can create wobble, then shouldn’t the questions be, is the system stuff enough, and why are we then concerned with a little wobble? I know the answer to the former question is yes, at least for my relatively meager output. Nevertheless, I’ve never found my backpedaling legs to exert so much stress on cranks that wobble to any degree. I say is because on one of my bikes, the front derailleur friction shifter will slip, and cause the cage to come pretty close to the chain. I’ve never found out the slippage through backpedaling, only through offsaddle cranking. For the latter question, if indeed even the slightest torque can cause such wobble, why even spend the effort to ensure the chainrings are entirely flat? Shouldn’t “looks flat to me when out on the table” be enough?
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